Reproducer for phonographs



J. A. BROWN.

REPRODUCER FOR PHONOGRAPHS.

APPLICATION FILED AlLG.27, 1919.

Patented Oct. 4, 1921.

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JULIUS A. BROWN, 01-? PEEKSKILL, NEW YORK.

REPRODUCER FOR PHONOGRAPHS.

Specification of Letters Patent.

Patented Get. 4, 1921.

Application filed August 27, 1919. Serial No. 320,091.

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Be it known that I, Junms A. liuowx, a native of Austria, and who has applied for citizenship of the l nited States of America, and a resident of Peckskill, in the county of IVestchestcr and State of New York, have invented certain new and useful, Improvements in Iteproducers for Phonographs, of which the following is a specification.

The object of the present. invention is to provide an improved phonograph reproducer in which supplementary sounding plates are provided in addition to the usual vibrating disk, to increase the resonance, and transmit the true sound effects, with the elimination of discordant sounds and abnormal vibrations.

In the accompanying drawing showing one embodiment of my invention, Figure 1 is a front elevation of the reproducer.

Fig. 2 is a vertical section of the same.

Fig. 3 is a front elevation of one of the sounding plates.

Fig. 4 is a vertical section through the latter.

Fig. 5 shows the several parts in a separated position.

The reproducer comprises essentially a frame, a rear supporting plate, a vibrating disk held by said members and provided with a stylus arm, a soundtube at the rear, and an additional vibrating member.

As set forth in the drawing, I show a frame in the form of a. ring 2 having at the front an inner flange 3, and at the bottom are journals 4, 4, in which is hinged a vibrat ing arm denoted generally by 5, that is secured to a vibrating disk 6. This disk is suitably held in the frame 2 against the flange 3. At the rear of the frame is an annular supporting plate 7 shown as having a conical portion 8 with a rim 9, that is secured to the rear of the ring 2 by suitable means such as screws, as shown. The rear frame has a flange portion 9, from which a rim 10 extends inwardly.

I further provide an additional vibrating member, shown in the form of an annular vibrating plate 11 having a tubular portion 12 extending rearward, that is screwthreaded as shown, and which may connect with the annular portion by a short conical portion 13. I also provide an annular plate 15 having a tubular portion 16 extending rearward,. which forms a part of the vibrating plate 11. The margin of plate 15 is socured to the plate 11 at the edge of the conical portion 13, by solder or otherwise. These members may be integral as shown in Fig. 4, or may be formed of two parts as indicated m Figs. 2 and 5 and suitably pressed together. The vibrating plate 11 is further provided with small apertures adjacent the tubular portion 16, as shown in Fig. 2. These apertures I find by experiment give the most advantageous results by making them less numerous at the lower portion than at the upper portion of the plate 15. As shown I provide two apertures 17, 17 on the horizontal diameter, two apertures 18, 18, below said apertures, and three apertures 19 above the middle apertures 17.

In assembling these several parts, the usual vibrating disk 6 is inserted in the frame 2, a rubber ring 20 being first placed against the flange 3. Then another rubber ring 21 is inserted against the margin of the disk 6, and thereupon the combined vibrat ing plate, as indicated in Fig. 4, is inserted against the rubber ring 21. The rear supporting plate 7 can now be applied, whose rim 9 will engage the margin of the disk 11 and hold the several vibrating plates, with their ring washers, in position, see Fig. 3.

The inner flange. 10 of the rear plate is caused to engage the conical portion 13 of the vibrating plate 11, but preferably a soft rubber cone 22 is first a plied to the cone portion 13, as shown in l ig. 3.

The rear sound-tube 23 is applied, by having its internal threaded portion 24 screwed on to the threaded tube 12 of the vibrating plate 11. This sound tube is provided with a flange 25 that engages the rear portion of the cone 8 of the supporting plate.

I further provide a rubber gasket 26 that is engaged by the flange 25 of the soundtube, and pressed against the inner flange 10 of the rear plate, and its tubular portion 9, as shown in Fig. 3.

By this arrangement it will be understood that the additional vibrating member is held at its margin, with the inner portion 15 free to vibrate, which contains the several apertures, and the tubular portion 16 of which is also free. At the same time the outer portion 11 of the vibrating member is connected with the rear sound-tube by the tubular portion 12. The vibrations imparted to the stylus will be communicated to the main vibrating disk 6, and these vibrations will be taken up and amplified by the vibrating disks 11 and 15. I have found by repeated experiments that a construction of this nature serves to reproduce the various tones whose vibrations have been recorded in the disk record, in true form and condition, and without the screeching and unpleasant sounds or noise at present frequently produced by the reproducers in use.

What I claim is '1. In a phonograph reproduoer, a frame, a vibratin disk held in said frame and carrying a vi rating arm, an annular vibrating plate held in the ring and provided with a free tubular extension at its inner edge, said annular plate having small apertures, and a conical ring extending forward from the intermediate portion of the annular plate and provided with a tubular extension at the inner edge, said apertures communicating with the space between said tubular extensions.-

2. In a phonograph reproducer, a frame, a vibrating disk held in said frame and carr ing a vi rating arm an annular vibrating p ate held in the ring and provided with a free tubular extension atits inner edge, saidannular plate having small apertures, a conical ring extending forward from the intermediate portion of the annular plate and provided with a tubular extension at the inner edge, said apertures communicating with the space between said tubular extensions, a sound-tube that is attached to said tubular extension and a rear supporting plate secured to said frame and engaging said sound-tube.

19Signed at New York, N. Y. on August 19,

JULIUS A. BROWN. 

